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Pope Benedict retires: What will his legacy be?

Pope Benedict XVI shocked the world on Monday when he announced his abdication—the first time a pope has stepped down since 1415.

Pope Benedict XVI arrives to greet the faithful after  the mass in St.Peter's Basilica to mark the 900th anniversary of the Order of the Knights of Malta, on February 9, 2013 at the Vatican.   (Photo by Andreas Solaro/AFP/Getty Images)
Pope Benedict XVI arrives to greet the faithful after the mass in St.Peter's Basilica to mark the 900th anniversary of the Order of the Knights of Malta, on…AFP – Getty Images